As shown in Fig. REF , for moderate \(t_c/K\) , the SC transition from
\((d+is)\)  to \(d\) -wave is accompanied with vanishing Kondo mean-field
parameters \(B\)  and \(D\) , which implies a breakdown of the Kondo hybridization
in the large doping side. Correspondingly, the Fermi surface structures also
change from a large hole-like Fermi surface around four Brillouin zone
corners at low doping to two separate electron-like Fermi surfaces (from
decoupled charge carriers) around the Brillouin zone center at large doping.
These results may be compared with the Hall experiments in Nd\(_{1-x} \) Sr\(_{x} \) NiO\(_{2}\)  [1]}, [2]}, which revealed a crossover line of
sign change in the temperature-doping phase diagram near the maximal \(T_c\) .
The line marks a potential change in the Fermi surfaces and resembles that
observed in some heavy fermion systems owing to the delocalization of
localized moments [3]}. It is thus attempted to link the
experiment with our theoretical proposals and predict a zero-temperature
quantum critical point with the SC transition and the Fermi surface change
near the crossover line, although it should be cautious that they take place
in different temperature region.
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